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MR imaging of the thyroid.

C B Higgins, M T McNamara, M R Fisher

AJR. American Journal of Roentgenology

|December 1, 1986

Summary

This summary is machine-generated.

Magnetic resonance (MR) imaging reveals distinct signal characteristics in thyroid disease. Diseased thyroid tissues show prolonged relaxation times, enhancing contrast for better lesion detection and extent assessment.

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Area of Science:

Radiology
Medical Imaging
Endocrinology

Background:

Thyroid diseases encompass a range of conditions affecting thyroid gland function.
Accurate imaging is crucial for diagnosis and management of thyroid pathologies.
Magnetic resonance (MR) imaging offers detailed anatomical and tissue characterization.

Purpose of the Study:

To evaluate MR imaging signal characteristics of normal and diseased thyroid tissue.
To determine contrast between normal and diseased thyroid tissue on T1- and T2-weighted images.
To compare relaxation times (T1 and T2) of normal thyroid, adenomas, and carcinomas.
To assess MR's capability in showing the extent of large thyroid masses.

Main Methods:

MR imaging was performed on six normal subjects and 32 patients with thyroid disease.

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Signal characteristics, contrast, and relaxation times (T1 and T2) were analyzed.

T1- and T2-weighted images were utilized for tissue differentiation.

Sagittal and coronal views were assessed for depicting the extent of thyroid masses.

Main Results:

Thyroid adenomas and carcinomas were often isointense on T1-weighted images but hyperintense on T2-weighted images compared to normal thyroid tissue.
Mean T1 and T2 relaxation times were significantly longer in adenomas and carcinomas than in normal thyroid tissue.
T1 and T2 values for carcinomas overlapped with those of adenomas.
Sagittal and coronal MR images effectively visualized the extent of large goiters, adenomas, and carcinomas, including cervicothoracic junction extension.

Conclusions:

Prolonged relaxation times in thyroid disease create excellent contrast between lesions and normal surrounding structures.
MR imaging's ability to display large fields of view aids in assessing extensive thyroid masses.
MR imaging demonstrates significant clinical utility for evaluating various thyroid diseases.